when you decide how much value to put in every pip, you have to take in to account how wide your stop loss is gonna be. id say never to risk more then 1-1,5% of your account on any one trade. if you think that for any given trade, a 30pip stop loss is appropriet, then divide 1 or at most(according to me) 1.5% of your account with 30 and you will end up with the maximum value per pip you can trade without risking more then 1-1.5% of your account. remmember that you dont have to, and maby should not, trade that big amounts all the time.
if you give your trades very large stop losses, 0,5usd per pip can whipe out 10% of your account. and if you trade with very tight stop losses, maby you could trade bigger lots without risking all that much of your total account.
//pipoholic
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